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漂亮的摇摆曲线
【案例】2013年安徽高考15题
圓的切線方程
平行線的斜率
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Is this a prism 10
阿基米德雙胞胎圓
GGB 基礎教學(平面幾何)
定理介紹:切線性質 | Tangent Properties
折叠问题一例